package com.ruoyi.framework.websocket;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Semaphore;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import cn.hutool.json.JSONUtil;
import com.ruoyi.common.enums.WebSocketType;
import com.ruoyi.common.utils.SemaphoreUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

/**
 * websocket 消息处理
 * 
 * @author ruoyi
 */
@Component
@ServerEndpoint("/websocket/{userName}")
public class WebSocketServer
{
    /**
     * WebSocketServer 日志控制器
     */
    private static final Logger LOGGER = LoggerFactory.getLogger(WebSocketServer.class);

    /**
     * 默认最多允许同时在线人数100
     */
    public static int socketMaxOnlineCount = 100;

    /**
     * 扩展同时在线多线程的数量(信号量)
     */
    private static Semaphore socketSemaphore = new Semaphore(socketMaxOnlineCount);

    /**
     * 连接建立成功调用的方法*
     * @param session   当前连接websocket的session对象
     * @throws Exception
     */
    @OnOpen
    public void onOpen( @PathParam(value = "userName") String userName,Session session) throws Exception
    {
        boolean semaphoreFlag = false;
        // 尝试获取信号量
        semaphoreFlag = SemaphoreUtils.tryAcquire(socketSemaphore);
        if (!semaphoreFlag) {
            // 未获取到信号量
            LOGGER.error("\n 当前在线人数超过限制数- {}", socketMaxOnlineCount);

            Map<String,Object> dataMap=new HashMap<>();
            dataMap.put("type", WebSocketType.LIMIT.getInfo());
            dataMap.put("data","当前在线人数超过限制数：" + socketMaxOnlineCount);

            WebSocketUsers.sendMessageToUserByText(session, JSONUtil.toJsonStr(dataMap));
            session.close();
        } else  {
            // 添加用户
            WebSocketUsers.put(session.getId(),userName, session);
            LOGGER.info("\n 建立连接 - {}", session);
            LOGGER.info("\n 当前人数 - {}", WebSocketUsers.getUserSession().size());

            Map<String,Object> dataMap=new HashMap<>();
            dataMap.put("type", WebSocketType.CONNECT.getInfo());
            dataMap.put("data","连接成功");
            //向连接的客户端发送消息
            WebSocketUsers.sendMessageToUserByText(session, JSONUtil.toJsonStr(dataMap));
        }
    }

    /**
     * 连接关闭时处理
     */
    @OnClose
    public void onClose(@PathParam(value = "userName") String userName,Session session) {
        LOGGER.info("\n 关闭连接 - {}", session);
        // 移除用户
        WebSocketUsers.remove(session.getId());
        // 获取到信号量则需释放
        SemaphoreUtils.release(socketSemaphore);
    }

    /**
     * 抛出异常时处理
     */
    @OnError
    public void onError(Session session, Throwable exception) throws Exception  {
        if (session.isOpen())  {
            // 关闭连接
            session.close();
        }
        String sessionId = session.getId();
        LOGGER.info("\n 连接异常 - {}", sessionId);
        LOGGER.info("\n 异常信息 - {}", exception);
        // 移出用户
        WebSocketUsers.remove(sessionId);
        // 获取到信号量则需释放
        SemaphoreUtils.release(socketSemaphore);
    }

    /**
     * 服务器接收到客户端消息时调用的方法
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        //{type:'insert_log','rows设备离开了电子围栏',userId:用户id,设备id,电子围栏id}


//        String msg = message.replace("你", "我").replace("吗", "");
//        WebSocketUsers.sendMessageToUserByText(session, msg);
    }
}
